643830057 has 12 divisors (see below), whose sum is σ = 1001513604. Its totient is φ = 396203040.

The previous prime is 643830037. The next prime is 643830079. The reversal of 643830057 is 750038346.

It is a happy number.

643830057 is a `hidden beast` number, since 643 + 8 + 3 + 0 + 0 + 5 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 342842256 + 300987801 = 18516^2 + 17349^2 .

It is not a de Polignac number, because 643830057 - 2¹² = 643825961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643830037) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2751294 + ... + 2751527.

It is an arithmetic number, because the mean of its divisors is an integer number (83459467).

Almost surely, 2^643830057 is an apocalyptic number.

It is an amenable number.

643830057 is a deficient number, since it is larger than the sum of its proper divisors (357683547).

643830057 is a wasteful number, since it uses less digits than its factorization.

643830057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5502840 (or 5502837 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 643830057 is about 25373.8065138047. The cubic root of 643830057 is about 863.4895430318.

The spelling of 643830057 in words is "six hundred forty-three million, eight hundred thirty thousand, fifty-seven".